The "sum" is the result of adding something together, and "digits" refers to the individual
numbers that make up 4521.
4521 has 4 digits. The digits in 4521 are 4, 5, 2, and 1.
When you are asking for the sum of the digits of 4521, you are basically asking what is
4 plus 5 plus 2 plus 1?
Therefore, the sum of the digits in 4521 is as follows:
4 + 5 + 2 + 1 = 12
Sum of digits in 4522
See if you can calculate the sum of the digits in the next number on our list before you go here.
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